Critical behavior and magnetocaloric study in La0.6Sr0.4CoO3 cobaltite prepared by a sol-gel process

Saadaoui F.; Mnassri R.; Omrani H.; Koubaa M.; Boudjada N. Chniba; Cheikhrouhou A.

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Critical behavior and magnetocaloric study in La0.6Sr0.4CoO3 cobaltite prepared by a sol-gel process

机译：La0.6SR0.4CoO3溶胶加工制备的La0.6SR0.4COO3钴矿的临界行为和磁热学研究

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The structure, magnetic properties, critical exponents and magnetocaloric effect (MCE) of La0.6Sr0.4CoO3 cobaltite are studied. A sol-gel method is used in the preparation phase. Phase purity, structure, size, and crystallinity are investigated using XRD and SEM. The temperature dependent magnetization exhibits a sharp paramagnetic-ferromagnetic transition (FM-PM) at the Curie temperature T-C = 230 K. By means of several methods such as modified Arrott plots, the Kouvel-Fisher method, and Widom scaling relation, the values of beta (corresponding to the spontaneous magnetisation), gamma (corresponding to the initial susceptibility), delta (corresponding to the critical magnetisation isotherm) and T-C are estimated for La0.6Sr0.4CoO3 around the FM-PM phase transition. Compared to standard models, the critical exponents obtained in our work are located near to those expected for the 3D Heisenberg model. Such results demonstrate the existence of ferromagnetic short-range order in La0.6Sr0.4CoO3. With the obtained values, one can scale the magnetic-field dependences of magnetization below and above T-C following a single equation of state. In the vicinity of T-C, the magnetic entropy change Delta S reached maximum values of 1.1 and 2.1 J kg(-1) K-1 under magnetic field variations of 2 and 5 T, respectively. The field dependence of the magnetic entropy changes are analyzed, which show power law dependence Delta S-max approximate to a(mu H-0)(n) at the transition temperature. Moreover, the temperature dependence of the exponent n for a different magnetic field is also studied. The values of n obey the Curie Weiss law above the transition temperature. It is shown that for La0.6Sr0.4CoO3 cobaltite, the magnetic entropy change and n(T) follow a master curve behavior.

机译：研究了LA0.6SR0.4COO3钴罐的结构，磁性，临界指数和磁热效应（MCE）。在制备阶段使用溶胶 - 凝胶法。使用XRD和SEM研究相纯度，结构，尺寸和结晶度。温度相关的磁化在居里温度Tc = 230k处具有尖锐的顺磁 - 铁磁转变（FM-PM）。通过几种方法，例如改进的arottlot，kouvel-fisher方法和Widom缩放关系，值β（对应于自发磁化），γ（对应于初始敏感性），达到在FM-PM相转变周围的LA0.6SR0.4COO3估计δ（对应于初始敏感性），Δ（对应于临界磁化等温线）和TC。与标准模型相比，我们工作中获得的批判性指数位于3D Heisenberg模型的预期附近。这种结果证明了La0.6SR0.4COO3中铁磁性短程顺序的存在。利用所获得的值，可以在单个状态方程之后缩放下方和高于T-C的磁化的磁场依赖性。在T-C附近，在磁场变化的磁场变化下，磁熵变化ΔS分别达到了1.1和2.1J kg（-1）k-1的最大值。分析了磁熵变化的磁场依赖性，其在转变温度下显示电力律依赖ΔS-max近似到（mu H-0）（n）。此外，还研究了指数n对不同磁场的温度依赖性。 n的值遵守过渡温度高于过渡温度的法律。结果表明，对于LA0.6SR0.4COO3钴罐，磁熵变化和N（T）遵循主曲线行为。

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《RSC Advances》 |2016年第56期|共10页
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Saadaoui F.; Mnassri R.; Omrani H.; Koubaa M.; Boudjada N. Chniba; Cheikhrouhou A.;
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Sfax Univ Fac Sci Sfax Lab Phys Mat BP 1171 Sfax 3000 Tunisia;

Kairouan Univ Unite Rech Mat Avances &

Nanotechnol URMAN Inst Super Sci Appl &

Technol Kasserine BP 471 Kasserine 1200 Tunisia;

Sfax Univ Fac Sci Sfax Lab Phys Mat BP 1171 Sfax 3000 Tunisia;

Sfax Univ Fac Sci Sfax Lab Phys Mat BP 1171 Sfax 3000 Tunisia;

Univ Gabes Fac Sci Gabes Cite Erriadh Gabes 6079 Tunisia;

Sfax Univ Fac Sci Sfax Lab Phys Mat BP 1171 Sfax 3000 Tunisia;

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1. Critical behavior and magnetocaloric study in La0.6Sr0.4CoO3 cobaltite prepared by a sol-gel process [J] . Saadaoui F., Mnassri R., Omrani H., RSC Advances . 2016,第56期

机译：La0.6SR0.4CoO3溶胶加工制备的La0.6SR0.4COO3钴矿的临界行为和磁热学研究
2. Effect of sintering temperature on structural, magnetic, magnetocaloric and critical behaviors of Ni-Cd-Zn ferrites prepared using sol-gel method [J] . Hcini Sobhi, Kouki Noura, Omri Aref, Journal of magnetism and magnetic materials . 2018,第OCTa期

机译：烧结温度对溶胶-凝胶法制备的Ni-Cd-Zn铁氧体结构，磁，磁热和临界行为的影响
3. Studies on the structure, critical behavior and magnetocaloric effect in (LaBi)SrCoO cobaltite [J] . F. Saadaoui, R. Mnassri, A. Mleiki, Journal of materials science . 2017,第20期

机译：（LaBi）SrCoO钴矿的结构，临界行为和磁热效应的研究
4. A Study on Li~+ Diffusion Behavior in Li_4Ti_5O_(12) Thin Film Electrode Prepared Through PVP Sol-Gel Process [C] . Young Ho Rho, Kiyoshi Kanamura Meeting of the Electrochemical Society . 2002

机译：通过PVP溶胶 - 凝胶制备Li_4Ti_5O_（12）薄膜电极Li +扩散行为的研究
5. Using an electronic health record to develop nursing process skills and critical thinking: A qualitative study about the students' experiences and behaviors. [D] . Kennedy, Diane. 2005

机译：使用电子健康记录来发展护理过程技能和批判性思维：关于学生的经历和行为的定性研究。
6. Sol-Gel Derived Tertiary Bioactive Glass–Ceramic Nanorods Prepared via Hydrothermal Process and Their Composites with Poly(Vinylpyrrolidone-Co-Vinylsilane) [O] . Dibakar Mondal, Andrei Zaharia, Kibret Mequanint, 2020

机译：水热法制备的溶胶-凝胶衍生的生物活性玻璃陶瓷纳米棒及其与聚（乙烯基吡咯烷酮-共乙烯基硅烷）的复合材料
7. Decision-making is the process of analyzing information about a problem situation and comparing it to a specific conclusion in order to solve a specific problematic (Yıkılmaz, 2001; Miller and Byrnes, 2001). Decision-making styles are a mechanism that is influenced by the internal and external conditions that determine the direction of the decisions of the individual, the content of the decision-making process, and the outcome of the decision-making process (Payne, Bettman and Johson, 1993; Bavol’ár and Orosová, 2015). ACT is a contemporary member of the Cognitive Behavioral Therapy family. ACT (Acceptance and commitment therapy) has both similar and different directions with Behavioral Therapies and Cognitive Therapies (Herbet and Forman, 2011; Hayes, 2004). KKT responds to classical behavioral treatments using both existential and cognitive approaches in the analysis of behavior. KKT is a science wing that tries to solve human problems with a wider perspective aimed at solving problematic human behaviors (Plumb, Stewart, Dahl and Lundgren, 2009). It is seen that there is very little research about the new approach of ACT approach when the aiming country of our country is screened and it is thought that our country will contribute to the field of psychological counseling with the work done. In the scope of the research, experimental and control groups and preliminary test, post-test and follow-up measurements of 2x3 experimental design were used. The study's study group consists of a total of 24 (12 experimental and 12 control groups) university students studying in different departments and levels, continuing their education in the academic year of 2015-2016 in Ağrı province and İbrahim Chechen University in 2015-2016 academic year. The average age of participants in the experiment and control group is 20. There were 12 participants in the experimental group, 7 female and 5 male, and 12 participants, 7 female and 5 male in the control group. Personal Information Form and Decision Making Style Scale prepared by the researcher were used in the research. In order to decide on the tests to be used in the course of analyzing the data, the scores of the participant's Decision Styles Scale pre-test, which are placed primarily in the experimental and control groups, it was analyzed whether the basic expectations of parametric tests were answered. As a result of the analysis made, the scores, skewness and kurtosis coefficients obtained from the Decision Making Styles Scale were given to the experimental and control groups. It was determined that the distribution was normal in the result of Shapiro-Wilk test, in which the skewness and kurtosis coefficients of each sub-scale were ranked between -1 and +1. Participants in the experimental and control groups; homogeneity test results for decision-style pre-test measurements indicate that the data are homogeneous. According to the results of the Mauchly Globalness Test, it has been determined that working supports the hypothesis. It was determined that there was no significant difference between the pre-test scores obtained from dependent decision-making style of experiment and control groups, but the test group showed lower mean scores at the significant level within the scores of post-test and follow-up tests. Therefore, it can be said that the ACT-oriented psychoeducation program applied to the experimental group reduces the dependent decision-making style scores from the decision style sub-dimensions and the psychoeducation program has a lasting effect. It was determined that there was no significant difference between pre-test, post-test and follow-up scores obtained from the Spontaneous-Instant Decision Style of experiment and control groups. Thus, it can be said that this situation does not cause a significant difference in the Spontaneous-Decision-Making Style scores from the decision style sub-dimensions of the ACT-oriented psychoeducation program applied to the experimental group. The ACT -oriented psychoeducation program had a decline in the intuitive decision-making styles of the individuals, but this decrease did not create significant differences. Thus, it can be said that this situation does not make a meaningful difference in the intuitive decision style scores from the decision style sub-dimensions of the KKT oriented psychoeducation program applied to the experimental group. The pre-test scores obtained from the rational decision-making style of the experimental and control groups showed that there was a difference between the post-test and the follow-up scores, but this difference was not significant. As a result of the analysis, it was determined that the test group had higher levels of rational decision style than the pre - test scores in the post test and follow - up scores, whereas the post test and follow - up test scores in the control group rational decision style showed a decrease compared to the pre - test scores. the pre - test scores. Decision-making Styles Scale Avoidant Decision Making As a result of the analysis of the mean scores of the subscale scores of pre-test, post-test and follow-up measures, the group effect was found to be insignificant. It was determined that the experimental and control groups differed significantly from the pre-test scores obtained from the avoidant decision-making style but did not show any significant change within the scores of the post-test and follow-up tests. [O] . mustafa ercengiz, ali haydar şar 2018

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8. Densification and crystallization of zirconia thin films prepared by sol-gel processing [R] . Schwartz, R. W., Voigt, J. A., Buchheit, C. D., 1993

机译：溶胶 - 凝胶法制备氧化锆薄膜的致密化和结晶

Critical behavior and magnetocaloric study in La0.6Sr0.4CoO3 cobaltite prepared by a sol-gel process

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